[Support request] No primary key for a model

Hi Charles,

I’ve got a table which logs keywords, schema is:

class Keyword(Model):
    name = CharField(null=False)
    created = DateTimeField(null=False, default=datetime.utcnow)

    class Meta:
        indexes = (
            (('created', 'name'), False)
        )

In short, I want to drop the auto-generated primary key column (id). How do I prevent it from being readded in subsequent db creations? I’ve taken a look into the manual and not found the syntax.

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In long, in the database however it has added an id column and associated pkey index. This table now has 35 million rows and that pkey index taking up 10gb in ram. I’ve taken a look into the code and it looks safe to drop the column, we only perform an aggregate query on the table in any case:

Keyword.select(Keyword.created, Keyword.name).where(Keyword.created > 3_days) OR Keyword.select().where(Keyword.created > 3_days).count()

Neither of these should need a primary key as we can get exact duplicates (35mil rows are for 3 days of data).

Many thanks, Alex

PS. It would also be awesome to be able to name index constraints, getting a few problems when running schema migrations because of name mismatches between environments.

[coleifer]

For models with no primary key, simply specify primary_key=False in the inner Meta class:

class Keyword(Model):
    name = CharField(null=False)
    created = DateTimeField(null=False, default=datetime.utcnow)

    class Meta:
        primary_key = False

If you want a multi-column primary key you can write:

class Keyword(Model):
    name = CharField(null=False)
    created = DateTimeField(null=False, default=datetime.utcnow)

    class Meta:
        primary_key = CompositeKey('name', 'created')

[perlun]

Thanks @coleifer for this answer of yours - it helped me greatly now, three years later. 👍 (I was struggling with peewee trying to retrieve data from a non-existing sequence as below)

psycopg2.ProgrammingError: relation "issue_assignees_id_seq" does not exist
LINE 1: SELECT CURRVAL('"issue_assignees_id_seq"')

Applying the primary_key = False to the inner class fixed the issue.